Alternating Current and AC generator
Alternating current and direct current are the two ways that electric current can flow. The direction in which the electrons flow is the primary distinction between AC and DC.
What is alternating current?
An alternating current is one whose magnitude changes continuously with time and whose direction reverses periodically.
In alternating current, the electrons don't move in only one direction. Instead they transfer from atom to atom in one direction for a while and then turn around and transfer from atom to atom in the opposite direction. An AC generator is used to make the flow of electrons first in one direction and then in opposite direction.
What is AC Generator ?
An AC generator is a device which converts mechanical energy to electrical energy.
It works based on electromagnetic induction which states that whenever magnetic flux linked with the conductor changes, an emf is induced in the coil.
Working Principle of AC generator.
When the armature coil rotates within the magnetic field producing continuous change in magnetic flux from minimum to maximum and to minimum with each rotation of the coil, emf is induced and the current flows in it.
The direction of the induced current can be identified using Flemings right hand rule.
Fleming's right hand rule.
It states that if we arrange our thumb, forefinger and middle finger of the right hand perpendicular to each other, then the thumb points towards the direction of the motion of the conductor, the forefinger points towards the direction of the magnetic field and the middle finger points towards the direction of the induced current.
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